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x in (-oo:+oo)
(1/4)*x-(9/2) = -13/8 // + -13/8
(1/4)*x-(9/2)-(-13/8) = 0
(1/4)*x-9/2+13/8 = 0
1/4*x-23/8 = 0 // + 23/8
1/4*x = 23/8 // : 1/4
x = 23/8/1/4
x = 23/2
x = 23/2
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